The major elements of the tunable Civ VUV FPI are the 35 mm MgF2 etalon plates with a plate finesse of F>25 at 155 nm, the π-dielectric coatings, a Hansen mechanical mount in a pressurize canister, and the piezoelectric control system.
Supplementary Table S1 Etalon data set: 202 various west Eurasian mtDNA haplotypes; investigated range: nps 16024 576.
Thus, FP01 and FP02 FP04 are 3.3 and 2.5 times higher in sensitivity, respectively, compared with that used at Shigaraki with 116 mm etalon, although FP02-FP04 are much smaller (70 mmϕ etalon) and considerably cheaper than FP00.
Graz SLR station uses the leading edge filter to compute the normal points of Ajisai since 5 March 2008 and of Etalon-1, Etalon-2, LAGEOS-1, and LAGEOS-2 since 5 February 2008.
Common approaches to the problem involve the use of micro-lens arrays [ 2 8], etalons [ 9], diffractive optical elements [ 10], or cascading beam splitters [ 11 15].
Fig. 3 Pictures of the Fabry-Perot interferometers, (a) body of FP01, (b) 70-mmϕ etalon on the holder, (c) body of FP02, (d) controllers and a personal computer for FP01 at Tromsø, and (e) water circulation system for cooling the CCD camera.
The sensitivity of the FPI optics is proportional to the throughput AΩ = 2π(1 − cos θ m )π(L/2)2 and etalon transmission T = (1 − R)/(1 + R).
Fig. 2 Schematic diagram of the Fabry-Perot interferometers FP02, FP03, and FP04, with small-aperture (70 mmϕ) etalon.
The 70-mm etalon in Fig. 3(b) is set into a black ring holder which has three vertical screws and springs to adjust the angle of the etalon manually.
The free spectral range of 15 mm etalon gap is ~0.013 nm for the 630-nm airglow.
Fig. 14 Interference fringes calculated for the three airglow emissions at OI 630.038 nm, OH 630.68 nm and OH 629.87 nm with etalon gaps of a 15 mm and b 20 mm.
